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Sec. 1.6 equations and mental math
- 2. Equation: has an = between two expressionsSolution: is when you substitute the number for the variable and it makes the equation true.
- 3. Tell whether the given number is a solution to the equation.9x = 36 ; 4y – 6 = 11 ; 163x = 39 ; 13
- 4. 9(4) = 36 36 = 36yes16 – 6 = 1110 11 no3(13) = 3939 = 39yesYou need to prove your answer.
- 5. We are going to use mental math to solve the equations. Here are some properties that might be helpful to keep in mind.
- 6. Identity Property of Addition# + 0 = #Identity Property of Multiplication# ( 1 ) = #Multiplication Property of 0# ( 0 ) = 0
- 9. Write the question as an equation and solve the equation.What number divided by 4 equals 7.What number minus 8 equals 4.